Carbon fiber bundle with adhered sizing agent

Abstract

A carbon fiber bundle having a high abrasion resistance property and simultaneously being excellent in widening property is provided by a carbon fiber bundle with an adhered sizing agent including a carbon fiber bundle, and a sizing agent adhered to a surface of the carbon fiber bundle, wherein the sizing agent contains an epoxy compound, and shows an intersection of a storage modulus and a loss modulus at an angular frequency in the range of 1×105 to 1×109 rad/sec in a measurement at 25° C.

The invention claimed is: 
     
       1. A carbon fiber bundle with an adhered sizing agent comprising:
 a carbon fiber, and 
 a sizing agent adhered to a surface of the carbon fiber, 
 wherein the sizing agent contains an epoxy compound, and shows an intersection of a storage modulus and a loss modulus at an angular frequency in the range of 1×10 5  to 1×10 9  rad/sec in a measurement at 25° C. 
 
     
     
       2. The carbon fiber bundle with an adhered sizing agent according to  claim 1 , wherein the sizing agent has Tan δ at 25° C. of 1 or more in an entire range of an angular frequency of 1 to 1×10 5  rad/sec. 
     
     
       3. The carbon fiber bundle with an adhered sizing agent according to  claim 1 , wherein the sizing agent further contains a thermoplastic resin, and the thermoplastic resin has a complex viscosity at 25° C. 1 Hz of 100 Pa·s or more. 
     
     
       4. The carbon fiber bundle with an adhered sizing agent according to  claim 1 , wherein the sizing agent further contains a polyoxyalkylene-based compound as an emulsifier. 
     
     
       5. The carbon fiber bundle with an adhered sizing agent according to  claim 4 , wherein the content of the polyoxyalkylene-based compound in the sizing agent is 1 to 50% by weight per 100% by weight of a total weight of the epoxy compound and the polyoxyalkylene-based compound. 
     
     
       6. The carbon fiber bundle with an adhered sizing agent according to  claim 2 , wherein the sizing agent further contains a thermoplastic resin, and the thermoplastic resin has a complex viscosity at 25° C. 1 Hz of 100 Pa·s or more. 
     
     
       7. The carbon fiber bundle with an adhered sizing agent according to  claim 2 , wherein the sizing agent further contains a polyoxyalkylene-based compound as an emulsifier. 
     
     
       8. The carbon fiber bundle with an adhered sizing agent according to  claim 3 , wherein the sizing agent further contains a polyoxyalkylene-based compound as an emulsifier. 
     
     
       9. The carbon fiber bundle with an adhered sizing agent according to  claim 6 , wherein the sizing agent further contains a polyoxyalkylene-based compound as an emulsifier. 
     
     
       10. The carbon fiber bundle with an adhered sizing agent according to  claim 7 , wherein the content of the polyoxyalkylene-based compound in the sizing agent is 1 to 50% by weight per 100% by weight of a total weight of the epoxy compound and the polyoxyalkylene-based compound. 
     
     
       11. The carbon fiber bundle with an adhered sizing agent according to  claim 8 , wherein the content of the polyoxyalkylene-based compound in the sizing agent is 1 to 50% by weight per 100% by weight of a total weight of the epoxy compound and the polyoxyalkylene-based compound. 
     
     
       12. The carbon fiber bundle with an adhered sizing agent according to  claim 9 , wherein the content of the polyoxyalkylene-based compound in the sizing agent is 1 to 50% by weight per 100% by weight of a total weight of the epoxy compound and the polyoxyalkylene-based compound.